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I recommend Electronics for Kids as a good introduction to electricity and electronics. Printed in full colour with many illustrations, it introduces common components with simple but interesting projects to build at each stage. The book starts by assuming no previous knowledge then carefully builds up straightforward explanations of how components work, plus practical techniques including wire-stripping, soldering and using a multimeter.

The electron was discovered in 1897 and it was found to have a negative charge. The guess made in the early days of electricity was wrong! Electricity in almost all conductors is really the flow of electrons (negative charge) from negative to positive.

Zero volts could be any point in the circuit, but to be consistent it is normally the negative terminal of the battery or power supply. You will often see circuit diagrams labelled with 0V as a reminder.

If several on-off switches are connected in parallel only one needs to be closed (on) to complete the circuit.